Maximum power demand indicator



Aug. 9, 1949. R. PUDELKO I 2,478,637

MAXIMUM POWER DEMAND INDICATOR 'Fi l ed Sept. 21 1946 I 2 Sheets-Sheet 1 I llllll' I lNVENTOR RICHARD PUDELKO 7 BY Z V A; T lif 5 9, 1949- Y R. PUDELKO 2,478,637

MAXIMUM POWER DEMAND INDICATOR Filed Sept. 21, 1946 2 Sheets-Sheet 2 INVENTOR RICHARD PUDELKO I M, a ATTORNEYS Patented Aug. 9, 1949 MAXIMUM'FOWER DEMAND INDICATOR; Richard Pudelko, Zug, Switzerland, assignor'to Landis & Gyr, A. G.,

zerland a body corporate of Swit-.

I Application September 21, 1946, Serial No. 698,562

* In Switzerland December 24, 1943' 3 Claims. (01. 17134) The present invention relates to a maximumdemand indicator with periodic self-acting reset and additionof the heaviest load averagevalues attained during a reading period".

This application is a continuation-in-part of,

my co-pending application Serial No. 528,993, filed March 31, 1944, now abandoned.

' The well known maximum-demand measuring instruments which: are employed for determining the maximum consumption, especially of electric plants, com'prise in the most commonly used fundamental make a pusher (driven by the counting system) for a sweep hand (maximum pointer) with or without inking or printing work. This pointer on the respective inking or printing work, if any, is, in regular tme intervals(recording or clock periods) of, say '15 minutes, uncoupled for a short length of time from the counter by a timing device, brought back to its starting position, and re-coupled;

With the ordinary maximum-demand measuring instruments the maximum average value of consumption for each recording period which occurred within a reading or computation period, e. g., a month, can be read off on the maximum attachment. 1 These maximum meters are indicating instruments which must be inspected on the site by a meterman of the operating works after expiration of each reading or computation period in order to take the reading of the maximum indication, to jot it down and to reset the maximum pointer to zero by hand.

' On the other hand, devices have also been developed in which, in combination with a timecontrolled. device for bringing the maximum Q pointer-afterthe lapse of a. reading periodautomatically back to zero from the peak position attained within this period, an inking device is providedwhich records thereset motion of the maximum pointer. already similar instruments with printing work which immediately prior to the trip of the reset .motion of the maximum pointer prints the value of the respective maximum position onto an underlayer. All of these known devices give. a corresponding number of indications fora greater number of reading periods. On the other hand,

however, for tariif reasons, it may occasionally tained by resetting the maximum pointer by hand Further, there exist 1 V 2 at the end of each reading period and trans-'- mission of this reset action onto a counter. 'To such devices, however, a serious objection is raised in that theyare dependent on attendance.

It is anobject of the present invention to obviate this drawback by providing,-in combination with a time-controlleddevice adapted automatically to restore to zero a maximum indicator- .after the lapse of a reading period-from its peak position attained withinthis period, a counting mechanism which continuously registers the values of the recurred maximum positions.

Of thegdrawings: I t a Fig. 1 is a schematic. showing of an illustrative embodiment of the present invention;

Fig. 2 is a detail view of certain of the movable gearing mechanism shown in Fig. 1, viewed as in- (heated by the line 2-2 inFlg. 1; and

Fig. 3 is a detail view of certain other movable gearing mechanism shown in Fig. 1, viewed as indicated by the line 3 3 in Fig. 1.

Referring now to the drawing, the rotatable shaft I of a meter maycarry: a worm 2 driving worm gear 3. Wormgear3 may drive a shaft 4 upon which gear 6 is mounted of gear combination 6 and 'l. This gear combination may have any desired gear ratio which may be adjusted to suit the required conditions. Gear 1 may drive meshing gear wheels 8 and 9 of a power indicating counter l0. Worm gear 3 also drives gear ll of gear combination I l'l2 also having a desired gear ratio which may be predetermined to suit the occasion. Gear 12 turns a shaft I3 upon which gear, 14 is mounted. Meshing with gear 14 is gear l5 mounted on a shaft l6 carrying dog [1.

Dog I! normally rests against stop l8 by virtue of spiral spring [9. However, during meter operation and assuming engagement of gears I 4 and I5, dog I! will be moved away from stop I8 and is adapted to push pin 2!) carried by maximum demand gear 2|.

Maximum-demand gear 2| meshes with gear 22 which gear carries pawl 23 so as to move with gear 22. Pawl 23 is adapted to cooperate-with ratchet 24 mounted upon shaft 25. Shaft 25 carrieszgear 26 which meshes with gear 21 making a gear combination 26-21 having any desired ratio. Gear 21 is mounted on ashaft 28 carrying calibrated demanddial 29 which dial may be coupled toa maximum demand register 30.

To time the various meanswithin the meter system, synchronous motor 3| may [be provided.

Synchronous motor 3| may drive shaft 32 carrying a plurality of gears. One gear may mesh with gears on shaft 33; which meshes with gears 3 on shaft 34 which, in turn, meshes with a gear on shaft 35. Shaft 35 drives demand interval control disc 36 which cooperates with pawl 31. As best shown in Fig. 2 of the drawings, pawl 31 serves as a journal for shaft I3 carrying gears 5 I2 and I4, and the pawl is mounted for pivotal movement aabouttam axis 38?. The fiihg er 3952M pawl 3'I-is adapted to ride on the outer periphery of control disc 36, being spring pressed against it 4 I9, and this shaft has a gear 80 engaging maximum demand gear 2|.

It is clear that once a month when one billing period ends, pawl 64 will be tripped momentarily. When pawl 64 is tripped, synchronous motor 3| will drive, through the various gears on shafts 32:43:14,; ;I I', 145,15, 'lfirandilfliimaximmm demand gear 2!. The direction oi this drive: is such that gear 2I is turned back so that pin 20 bears by a leaf spring 4| bearing against the pawl. A 110? against do I! which, in turn, bears against stop notch, designated by the numeral-, livin xFigg 2 4st.

provided in disc 36, and upon each complete revolution of the disc, the fingerx3wfails onoe iritmtliea notch 40, and pawl 3'! pivots 'slfglitly about axis I8 Theendiot-a billing period coincides with the end "of a demandperiod, so that gears I4 and I5 are ouiipfimeshr during this action.

Atath'e beginning of a billing period, gear 2| 38 carrying with it an end of shaft I3. This acand dog ll 'bbti'l 'start from their initial starting tion marks the end of aademand intepval,;.and

gear I5. During this disengagement of gears I4 and I5, spiral spring ,.I9 will turn dog-I'Fback' positionaathstomlfl... Dog I'I moves forward during eaehedemand'period to push pin ahead. The position of pin 20 will be determined by the maximum movement of dog II during a billing against stop I 8. This demand interval may be 20 period. This positiomof dog I! will be deterany =des-ired timesuch as fifteen minutes, .for irrstance; sothat everwfifteerr minutes dog 'l l goes back against stopr-la. It is u-nderstood that pin amount corresponding toe tffemaacfr' nrzm power during a demand interval;

Shaft 32 also controls the-- meter-system tc y-reset maxir'nugn demand gear 21 at th e end of a minedziby:theeamounimf:powezzmeteredriuring a demands peribd. At: the? end'i at; each demand periods gears lkamdgi I511 areemiomentarily disengaged so thattdoggl i zstarts fronrithelbegisnmns terval l With movemenIr-ofzgearrfl ir'ru'esponseto maximunr demandzmovementzof dogg I'Lxgearl 22 is aisotimnved. Therdinection; oft-movement :ofiggar shaft' 3 2 d1ives gears on= shaf-fifli whichi imm drives gears on" sh'ait including a gear 46. Shaft 44 drives pinion 45 engaging 'large-gear 47. Gear 41 carries pinion 48 lock'edi thereto along? thez-rteeth .ofiratchet'l lo 'I'heeamountiof movementnaturallmdependsaupon thamaximum demaml: during: any! demand interval. Hence, thecback ward 'movementmtipawl 1.2 3.-:may ,-also.-be

which meslies with large gear flfi Uargezgearrw 5: considered zanczindi'catiom of; maximum? demand drives pinion which} in" term: dfives= large gear= 5I Gear 53 caa'ris piirion -iwand through gear 53, pinion :54,.gear'- 55: amt piniOmEE driVes gear-51. Tlie gear ratio betweenrthree discqgears duringiaa-hii-lingazperiodc. The :d IiViIIgf Of": gear.- 2I byr dog II- also involves the; gears: on shafits;-19,,16'; I5; and II;, but.-g earss46-.-and 12.:aree disengaged: atzthis time soi therei-ismo the order o f-oneto ozre' hnndr ed between adjacent 'gears. Thus, gear il may have its-"speed reduced down so thlat -itimak'es a; complete revo lotion: once= ever-y th irty daysr Gear illwill turn ten-thousandtimes'as'fasti ripheryY Cooperatingwitl'ficanmdfscs16$? B land Atathez-endaof theebill-ingr; period, synchronous motorrSh turns gfim'fllrbafikr againstl stop.I8. When gean 2 I- is: movedl-ibaekt'owardcz stop I8, gear: 22; is? alsoomaveaz Duringg this resetting ,;movement=.of geari-22apawl 2fisenga es ratchet 2mm wzgg: theesamwthroughnm anglerdependingguppmthe resettingmmvement .ofvdemand. gear 21; movement of; ratchet 24-1 naturally causes: movement sot 2 9 :andtdemand; reg.-

peripheries of cam discs- 6Ha11d' 62; being spring pressed-' toward therdiscsi bya leaf-spring 6f'engaging thepawiz Tliealignmerrt' offinotch es 63 in cam-discs =6? 6 I anti-" BlDrnarWs=th'e endt of a Itbisi-understoodu that means for: shnwing the momentary maximum i positiommay? be provided-i. Thiis,-;.ggar:22fmaygdrive pinion-B2 which man operatesmeansra 88.: for: showing momentary readlngorw'billi ng eperiod; and 'atltl'iatitii-ne fingers 55:,a a'xilmlm position;

66 f an:- into thes respective-- n otches and pawifi 6d is pivoted' about shaffifiif Thn's pawtlIiManw-the three di'SCSi function". as: a; coincidence means which will operateeonceeapmonth; Pawl'jlil an" integral arm-t'lllfiat thiecfreeserrd ot' which is'; 60'? mounted stub shaft II. Stubshait'flll carries a gear n which; as sh'ow n irrsFigsii is' always in meshwith a gear I3 on a shaft hi 'and which is adapted to mesh witiizgear lfifionhshaft 44 when pawl 64 1s tripped and arm 'IWsupportirigslfafiti-oa I 1 15 pil'iote(YEL'lB'Oll-ii its shaifii 'fi 5 In, Fig? l of thie drawings gears 40 and- I2 are shown. slightly spaced' for greater clamityt'but it te b'e understood"that the true relationship-entrie gears fis that shown iii Fig-z 3; which is sech =th'at gear I2 6 To meshes withgear ylfi upon pivotal movement of the iimvent-iorr and without sacrificing its chief advantages;

What Pclaim i5:-

1'. A demand meter having means for indicatingthe'maximum' power within a demand int'erval" over -"a'- b'i-llirig period, said' meterr being' of the type whereir r a member is' moved" during J a p o w fl fi 1* ear" T! on. shaft dmand interval ancl periodically retin'newto its starting position, said meter including a power meter for indicating power consumed, a demand register, means for indicating the maximum power demand interval within a billing period, and time controlled means for resetting said maximum power demand indicating means at the end of a billing period and actuating said demand register, said time controlled means comprising a synchronous motor, a plurality of rotatable discs each including a control means, a reduction gear train drivably coupling said discs providing a high step-down speed ratio therebetween whereby said control means coincide once during said billing period, means coactable with said discs for detecting the coincidence of said control means, and means carried by said last named means temporarily coupling said demand resetting and register actuating means to said motor upon coincidence of said control means whereby said time control means is periodically operable to accurately control the change over between successive billing periods.

2. The structure of claim 1 wherein said discs have notches in their peripheries to function as the control means.

3. A demand meter having means for indicating the maximum power within a demand interval over a billing period, said meter including a power meter for indicating power consumed, a demand gear, means including a dog connecting said power meter and demand gear, said demand gear having an initial predetermined starting position at the beginning of a billing period, said dog having an initial starting position at the beginning of a demand interval, a synchronous motor, intermittent means controlled by said synchronous motor for disengaging said dog and. power meter at theend of each demand interval for a short time, means for returning said dog to its initial starting position during said disengagement, said dog travelling over a range determined by the power meter during said demand interval and moving said demand gear an amount corresponding to the maximum power during a demand interval within a billing period, a demand register, pawl and ratchet means connecting said register and said demand gear, said pawl and ratchet being'adapted to slip during said movement of said demand gear from its initial starting position but to engage during movement of said demand gear back to its initial starting position, a plurality of rotatable discs each having a notch in its periphery, a reduction gear train drivably coupling said discs to provide a high step-down speed ratio therebetween whereby said notches coincide once during a billing period, means coupling said gear train to said motor, means coactable with said discs for detecting the coincidence of said notches, and means operable by said coactable means upon coincidence of said notches temporarily coupling said pawl and ratchet means to said motor whereby said demand gear is automatically reset to initial starting position for operation through a subsequent billing period.

RICHARD PUDELKO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 972,538 Karapetoff Oct. 11, 1910 1,619,473 Holtz Mar. 1, 1927 1,654,730 Holtz Jan. 3, 1928 1,664,243 Chubb Mar. 27, 1928 2,123,977 Wagner July 19, 1938 

